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Paper Details

Kinetics of sulphate release in soils of Jharkhand


Journal Title:International Journal of Agricultural Sciences

Ten selected soils from Alfisols and Ultisols soil orders of Jharkhand having varied physico- chemical properties were extracted with 0.15% CaCl2 (1: 5 soil solution ratio) at selected time intervals (15, 30, 45, 60, 120, 300, 600 and 1200 minutes). The results indicated that each soil has differential variable with respect to sulphate desorption. The amount of sulphate S desorbed by 0.15 % CaCl2 at different time intervals varied from 11.60 in Alfisol of Dhanbad after 15 minutes of extraction to 63.13 mg kg-1 after 1200 minutes. The mean amount of sulphate desorbed at different time intervals varied from 19.84 to 43.86 mg kg-1 . The per cent of sulphate S desorbed was more in Alfisols as compared to Ultisols. The amount of sulphate S desorbed varied with soil type as the rate of desorption reaction is controlled by the diffusion of sulphate ions through soil particles or aggregates. The amounts of sulphate S desorbed at different time interval were fitted into different kinetic models wherein it was found that the desorption of sulphate in the soils of Jharkhand was satisfactorily described by the first estimate equation.